Sukjai, Patthaphon, and Chainarong Srirak. “Cross-border medical tourism of tourists in Thailand’s border provinces: A case study of Laotian tourists in Nongkhai and Udon Thani Patthaphon”. Kasetsart Journal of Social Sciences 43, no. 1 (February 2, 2022): 123–130. accessed December 5, 2025. https://so04.tci-thaijo.org/index.php/kjss/article/view/257001.